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The lens in the adult human eye blocks nearly 100 percent of the sun's UV rays. As part of the normal aging process, the eye's natural lens eventually blocks some short-wavelength blue light as well â the type of blue light most likely to cause damage to the retina and lead to macular degeneration and vision loss.
Figure 3 - Extended and Point Source Power Density at the Retina. The band of wavelengths that pass through the outer eye structures and reach the retina includes the entire visible light spectrum from blue (400 nanometers) to red (700 nanometers), and the near-infrared range of 700 to 1400 nanometers (IR-A).